1. Stand back to back! 
   背靠背站好！
2. Back to Back L/C 
   背对背信用证
3. be tracked back to 
   追溯到
4. Back-to-back performances; back-to-back home runs. 
   连续的演出；连续的本垒打
5. Under the testing and tracing back system, pigs are tattooed with consignment-specific, five-digit numerals identifying the farm of origin and are tested for clenbuterol on admission to slaughterhouses. 
   根据测试及追查系统，猪只身上均刺上该批猪只专用的五位编码，以识别生产猪场。猪只在送入屠房时，必须接受氨哮素测试。

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